condition mean min max ZT0-3 0.91071792575 0.6551498370000001 1.1662860145 ZT4-7 2.47720931025 2.355172503 2.5992461175 ZT8-11 2.6370212480000004 2.5168537970000004 2.7571886990000003 ZT12-15 3.3110798179999996 2.6622666759999998 3.95989296 ZT16-19 4.507073254 4.487423633500001 4.5267228745 ZT20-23 4.46786676475 4.190776776 4.7449567535